Amadeus II should work OK on an Intel Mac using Rosetta: but if you are trying to use it with plugins which are Intel versions this won't work: a program and the plugins have to be all PPC or all Intel. In the same way Amadeus Pro can't use PPC plugins.

Also why is it that those same plugs will work in for example Cubase Essentials 5 or Digital Performer 7 or LogicExpress 9 but crash dear old AmadeusPro?

Every host is slightly different, so plug-ins that don't quite adhere to the standards can broke one host and appear to run fine on another. In the case of SFX Machine, I am aware of the bug that crashes AP on some systems. This is a bug in SFX Machine, not in Amadeus Pro.

I have sent a report to their developers, but they essentially refused to work on it since they cannot reproduce the problem on their side Regards,